在 iPython 中使用 style.format 打印 pandas df

Question

Minimal working example:

import pandas as pd
df = pd.DataFrame({
    'letters':('A', 'B', 'C'),
    'numbers':(0.1111, 0.2222, 0.3333)
}).set_index('letters')
df.style.format('{:.2f}')

Result:

Out[4]: <pandas.io.formats.style.Styler at 0x7f963f826eb8>

What I want:

Something similar to the default Jupyter output:

Answer 1

One way to do this is using the formatters or float_format keyword of df.to_string

>>> print(df.to_string(float_format=lambda x: '{:.2f}'.format(x)))
         numbers
letters         
A           0.11
B           0.22
C           0.33

float_format will apply a function to all floats to format, while formatters can accept a list or dict to format specific columns in the dataframe.

Answer 2

Minimal working example:

import pandas as pd
df = pd.DataFrame({
    'letters':('A', 'B', 'C'),
    'numbers':(0.1111, 0.2222, 0.3333)
}).set_index('letters')
df.style.format('{:.2f}')

Result:

Out[4]: <pandas.io.formats.style.Styler at 0x7f963f826eb8>

What I want:

Something similar to the default Jupyter output: